| Re: cw_fslider [message #13944 is a reply to message #13926] |
Tue, 22 December 1998 00:00  |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Lisa Bryan (lbryanNOSPAM@arete-az.com) writes:
> I am having problem with the DRAG keyword to the CW_FSLIDER function.
> When using this slider I want to see the values change as I slide the
> slider button. This feature is described in the help section under
> the keyword DRAG. According to the help section by setting /DRAG, I
> should be able to see events as I drag the slider button. And, in
> fact, this works as described in the WIDGET_SLIDER function using the
> same keyword. Unfortunately, I need to use the floating version of
> this function.
Humm, I don't know why this is happening. Drag events are not
available for all machines, but if you see it working on normal
sliders, then it should certainly work for floating sliders.
Are you sure you have seen it working on *this* machine?
I don't see anything in the CW_FSLIDER code that would cause
problems, although this code is a mystery:
IF NOT (KEYWORD_SET(drag)) THEN drag = 0
Does anyone see any advantages (other than its harder to
understand and protects your job better) than this simpler
construction:
drag = Keyword_Set(drag)
> BTW, I'm using this to build a tool for interactively
> changing the greylevels of a displayed image. Anyone out there
> already done this?
Have you seen my program XStretch? This puts up a
histogram plot of the image (along with the image)
and allows you to interactively move two bars in
the window. (It's like a double slider, I guess.)
The image pixels are "streched" between the values
of the two bars.
http://www.dfanning.com/programs/xstretch.pro
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Progamming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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